linux-kernel - Re: [PATCH AUTOSEL 4.4 4/9] parisc: Provide an extru

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Message-ID: <20211204121553.GA14855@duo.ucw.cz>
Date:   Sat, 4 Dec 2021 13:15:53 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Helge Deller <deller@....de>,
        John David Anglin <dave.anglin@...l.net>,
        James.Bottomley@...senPartnership.com, svens@...ckframe.org,
        linux-parisc@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.4 4/9] parisc: Provide an extru_safe() macro to
 extract unsigned bits

Hi!

> From: Helge Deller <deller@....de>
> 
> [ Upstream commit 169d1a4a2adb2c246396c56aa2f9eec3868546f1 ]
> 
> The extru instruction leaves the most significant 32 bits of the
> target register in an undefined state on PA 2.0 systems.
> Provide a macro to safely use extru on 32- and 64-bit machines.

As the macro is not used by subsequent 4.4 patches, I don't believe
this is suitable for -stable.

Best regards,
								Pavel
-- 
 'DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk'
 'HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany'


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